If we have the ability to detect a crime at low cost, we should detect the crime and apply the law uniformly, and dispassionately. It should be applied as often

If we have the ability to detect a crime at low cost, we should detect the crime and apply the law uniformly, and dispassionately. It should be applied as often as possible. Either the law exists and is enforced, or the law should be repealed. In your hypothetical scenario, if I have crimes I've "already committed", then those should have already been brought up. But that's sort of my point as well. I think we can come up with the regulations to avoid the situation you describe. It may involve what I suggested above, updates to statutes of limitation, etc.